Why is Friday the 13th considered unlucky? Why do we knock on wood? Why do we cross our fingers for good luck? It may not be logical, but as this lighthearted and entertaining exploration of persistent superstitions makes clear, these irrational notions are founded on centuries of cherished beliefs, and still influence our behavior for such major concerns as health, marriage, children, and prosperity. With color cartoons and illustrations throughout, this amusing reference illuminates both the ridiculousness of human nature and the benefits accorded by the personal rituals of superstition.